Watts CLX - Modbus Owner's manual

Brand: Watts

Model: CLX - Modbus

Type: Owner's manual

Watts CLX - Modbus is a versatile device that offers a range of capabilities for monitoring and controlling chlorine levels. With its RS-485 port, it can be integrated into a network of up to 255 slave devices, allowing for centralized monitoring and control.

The CLX - Modbus supports both RTU and ASCII communication modes, providing flexibility in integration with different systems. It features configurable baud rates, instrument addresses, and data formats, ensuring compatibility with various communication protocols.

The device provides access to a wide range of data, including sensor readings, alarm status, and configuration parameters. Users can read and write to coils, input status, holding registers, and input registers, enabling remote monitoring and control of chlorine levels.

MODBUS MANUAL

For the

CLX

Online Chlorine Analyzer

HF scientific, inc.

3170 Metro Parkway

Ft. Myers, FL 33916

Phone: 239-337-2116

Fax: 239-332-7643

E-Mail:

[email protected]

Website: www.hfscientific.com

Catalog No.

24569 (8/06)

Rev. 1.2

1.0 Overview

The HF Scientific CLX uses a communication protocol called Modbus. A company called

Modicon, for use with their programmable controllers, developed the Modbus protocol.

Since that time Modbus has evolved into common communication protocol in industry.

The communication method involves using a master-slave technique, in which there is one

master and several slaves. The CLX is a slave device. Only the master can initiate queries.

These queries are directed to an individual slave device and the appropriate slave responds

with the requested data.

A broadcast message can be sent to all slaves. The slave devices do not answer these

broadcasts.

There are two transmission modes. These modes are known as RTU (Remote Terminal

Unit) and ASCII (American Standard Code for Information Interchange).

The CLX can be setup in a network of up to 255 slave devices. Each device must have a

different address (1-255). The CLX can be set for either RTU or ASCII mode.

CLX Modbus (8/06)

Rev. 1.2

2.0 Electrical Connections

All of the electrical connections to the instrument are made at the termination area, which

is located on the portion of the instrument. The connections are labeled and are self-

descriptive (see Figure 1). Please follow all local and government recommendations and

methods for installation of electrical connections to and between the instrument and other

peripheral devices.

Plugs are inserted into cable bulkheads when shipped, to ensure a watertight seal. These

plugs should be removed and discarded as required when cabling to this connection.

The bulkhead will accept cable diameters from 5.8mm (.230 in.) up to 10 mm (.395 in.).

The terminals are designed to accept wires in the range of 14-28 AWG. All wires should

be stripped to a length of 6 mm

It is the user’s responsibility to assure that the watertight seal is maintained after the

terminal box has been wired for operation. If any of the bulkheads are not tightened

properly around a cable or plug, the ratings of the instrument will be jeopardized and there

is a possibility of creating a shock hazard.

Note: Only qualified electricians should be allowed to perform the installation of the

instrument as it involves a line voltage that could endanger life.

CAPTIVE SCREW

HIGH VOLTAGE C OVER

ALARMS

BULKHEAD

COMMUNICATION

BULKHEAD

POWER

BULKHEAD

POWER

TERMINAL

BLOCK

POWER CABLE

STRAIN RELEIF

ANC HOR

ALARM # 2

TERMINAL

BLOCK

ALARM # 1

TERMINAL

BLOCK

RS- 485

TERMINAL

BLOCK

4- 20mA

TERMINAL

BLOCK

Figure 1: Electrical Connections for the Instrument

CLX Modbus (8/06)

Rev. 1.2

2.1 RS-485 Connection

The RS-485 half-duplex (2-wire) digital interface operates with differential levels that are

not susceptible to electrical interferences. This is why cable lengths up to 3000 ft can be

implemented. The last device on every bus may require a 120-ohm termination resistor to

eliminate the possibilities of signal reflection on the line. Do not run RS-485 cables in the

same conduit as power.

Ensure each instrument is not powered when connecting the RS-485 line. To prevent

damage to the instrument, ensure that power is disconnected prior to making connections.

CLX Modbus (8/06)

Rev. 1.2

3.0 Operation

3.1 Configuring the RS–485 Port

The CLX is equipped with an RS-485 port which operates in one of three ways (see the

operator’s manual for more information).

Select the correct baud rate (1200, 2400, 4800, 9600, or 19200) for operation of the I/O

port by pressing the t or u buttons to change the displayed baud rate.

Press the ↵ button to continue on and select the desired instrument address (1-255) using

the t or u buttons. Once the selection is satisfactory, press the ↵ button.

Select the operating mode either ASCII or RTU using the t or u buttons. Press the

MODE key to complete the Modbus setup.

CLX Modbus (8/06)

Rev. 1.2

3.1 Configuring the RS–485 Port (continued)

For Modbus some applications, especially involving the ASCII operation mode, it may be

necessary to set a different protocol than the default setting (8 bits, 1 stop bit, no parity).

Menus are available for this in the Extended Settings portion of the configuration

CONFIG mode.

While in the CONFIG mode, press the ↵ button, several times until the Extended Settings

is as shown below. Select On using the t or u buttons.

Press the ↵ button a few times until the menus appear for BITS, PRTY (Parity) and

STOP (Stop Bits). Set each one to the desired setting using the t andu buttons.

CLX Modbus (8/06)

Rev. 1.2

4.0 The Modbus RS-485 Output & Commands Implemented

The default communication parameters are 8 bits, no parity and 1 stop bit. Please note that

all Modbus communication is via RS-485. The instruments can support a two wire

multidrop network of 255 units. If the connection is to the master on USB, an RS-485 to

USB converter is required.

4.1 Coils

These single-bit values are readable and changeable from the master. The data will be returned

with the lowest addressed coil in the LSB of the data. Unused bits in the data will be set to 0. True

is a 1 and False is 0.

4.1.1 Valid Command(s)

Code Name Broadcast

0x01 Read Coil Status No

0X05 Force Single Coil Yes

4.1.2 Format

16-bit word format

MSB LSB

Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

4.1.3 Valid Addresses

00001 – 00XXX

4.1.4 Definitions

Address Function Default

00001 Access code enabled False

00002 RS-485 enabled True

00003 4-20 mA enabled False

CLX Modbus (8/06)

Rev. 1.2

4.2 Input Status

These single-bit values are readable from the master. The data will be returned with the lowest

addressed input status in the LSB of the data. Unused bits in the data will be set to 0.

4.2.1 Valid Command(s)

Code Name Broadcast

0x02 Read Input Status No

4.2.2 Format

16-bit word format

MSB LSB

Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

4.2.3.Valid Addresses

10001 – 10XXX

4.2.4 Definitions

Address Function Default

10001 Instrument error False

10002 Instrument error with alarm (levels 1,2and 3) False

10003 Alarm 1 active False

10004 Alarm 2 active False

CLX Modbus (8/06)

Rev. 1.2

4.3 Holding Registers

These 16-bit values are readable and changeable from the master. The data is stored and

transmitted with the MSB first and then the LSB.

4.3.1 Valid Command(s)

Code Name Broadcast

0x03 Read Holding Registers No

0x06 Preset Single Register Yes

0X16 Preset Multiple Registers Yes

4.3.2 Format

Float – stored in two consecutive addresses, with the first address containing the least significant

word (lower part of mantissa) and the second address containing the most significant word (sign,

exponent, and upper part of mantissa).

4.3.3 Valid Addresses

40001 – 40XXX

4.3.4 Definitions

Address Type Register Min Default Max Function

40001 Int Decimal places 0 2 3 0 – XXXXX

1 – XXXX.X

2 – XXX.XX

3 – XX.XXX

40002 Int Units (scaling) 0 0 1 0 – PPM

1 – MG/L

40003 Int Response speed 1 10 60 Time constant (minutes)

40004 Int LCD backlight 1 8 10 Higher is brighter

40005, 40006 Float 4-20 mA

minimum value

0.0 0.00 10.0 Scaling value

40007, 40008 Float 4-20 mA

maximum value

0.0 6.00 10.0 Scaling value

40009 Int 4-20 mA error

alarm output

0 2 3 0 – Off

1 – 0 mA

2 – 2 mA

3 – 4 mA

40010 Int RS-485 baud 0 3 4 0 – 1,200

1 – 2,400

2 – 4,800

3 – 9,600

4 – 19,200

40011 Int RS-485 data bits 0 1 1 0 – 7 bits

1 – 8 bits

40012 Int RS-485 parity 0 0 2 0 – None

1 – Even

2 -- Odd

CLX Modbus (8/06)

Rev. 1.2

Address Type Register Min Default Max Function

40013 Int RS-485 stop bits 0 0 1 0 – One

1 -- Two

40014 Int Instrument

address

1 1 255

40015 Int Modbus serial

mode

0 0 1 0 – RTU

1 – ASCII

40016 Int Alarm 1 type 0 0 2 0 – Off

1 – Low alarm

2 – High alarm

3 – Error alarm

40017, 40018 Float Alarm 1 set point 0.0 1.0 10.0

40019 Int Alarm 2 type 0 0 2 0 – Off

1 – Low alarm

2 – High alarm

3 – Error alarm

40020, 40021 Float Alarm 2 set point 0.0 1.0 10.0

40022, 40023 Unused

40024 Int Measurement

period

90 150 600 Seconds between

measurements

40025 Int Response speed 0 10 30 Response time constant,

in minutes

40026 Unused

CLX Modbus (8/06)

Rev. 1.2

4.4 Input Registers

These 16-bit values are readable by the master. The data is stored with the MSB first and then the

LSB.

4.4.1 Valid Command(s)

Code Name Broadcast

0x04 Read Input Registers No

4.4.2 Format

Float – stored in two consecutive addresses, with the first address containing the least significant

word (lower part of mantissa) and the second address containing the most significant word (sign,

exponent, and upper part of mantissa).

4.4.3 Valid Addresses

30001 – 30XXX

4.4.4 Definitions

Address Type Register Value Function

30001, 30002 Float Sensor reading -- The meter reading

30003, 30004 Float Sensor reading raw -- Sensor reading to six significant places

30005 Int Version major -- Software version major number

30006 Int Version minor -- Software version minor number

30007 Int Version revision -- Software version revision number

30008 Int Model number -- Product number

30009 Int Model suffix number -- Options – model dependent

0 unknown

1 normal

2 Over range

3 Under range

4 need standard

5 need sample

30010 Int Reading status

reading problem (Err)

30011 Int Days since last prime -- No.of days since the last prime was performed

0 Revision 1 30012 Int PCB Revision

1 Revision 2

0x0000 normal

0x0001 Error

0x0002 Alarm 1 is active

0x0004 Alarm 2 is active

30013 Int Instrument error

summary (bit-mapped)

0x0008 Calibration error

0x00000 Normal

0x00001

Alarm 1 active (ALM1)

0x00002

Alarm 2 active (ALM2)

0x00004

Data over-range (OVER)

30014, 30015 Long Level 4 Errors (bit-

mapped), least severe

0x00008

Reading error (Err)

CLX Modbus (8/06)

Rev. 1.2

0x00000 Normal

0x00001

Break in the 4-20 mA current loop (MA)

0x00002

Calibration error (ZCAL)

0x00004

No intake water (WATR)

0x00008

Intake water fill fast (FAST)

0x00010

Intake water fill slow (SLOW)

0x00020

Purge is slow (PURG)

0x00040

Purge clogged (NPRG)

0x00080

Cannot determine intake water level (H2O)

0x00100

Intake solenoid stuck open (ISOL)

0x00200

Purge solenoid stuck closed (PSOL)

0x00400

Problem with reagent (RGNT)

0x00800

Sample chamber glass too dark (GLAS)

0x01000

Water calibration invalid (WCAL)

0x02000

Reagent is old and needs to be replaced (REPL)

30016, 30017 Long Level 3 Errors (bit-

mapped)

0x04000

Adjust calibration error (ACAL)

0x00000 Normal

0x00001

POST error (POST)

0x00002

Visible lamp blown (GRN0)

0x00004

Visible lamp stuck on (GRN1)

0x00008

Visible lamp optimization problem (GRN2)

0x00010

IR lamp blown (WTR0)

0x00020

IR lamp stuck on (WTR1)

0x00040

IR lamp optimization problem (WTR2)

0x00080

Solenoid power supply (SOL0)

0x00100

Intake solenoid (SOL1)

0x00200

Purge solenoid (SOL2)

30018, 30019 Long Level 2 Errors (bit-

mapped)

0x00400

Reagent solenoid (SOL3)

0x00000 Normal

0x00001 MSP oscillator

0x00002 MSP A/D

0x00004 MSP flash data read

0x00008 MSP flash data write

0x00010 A/D problem

0x00020 S/W MiCOS queue overflow

0x00040 S/W stack overflow

0x00080 S/W invalid PWM port

0x00100 S/W options missing

30020, 30021 Long Level 1 Errors (bit-

mapped), most severe

0x00200 S/W sensor type option

CLX Modbus (8/06)

Rev. 1.2

Note: Error messages shown in Prentiss and in (Italics)

4.5 Exception Responses Implemented

Code Name Meaning

00 -- No error

01 ILLEGAL FUNCTION The function code is not allowed in the device.

02 ILLEGAL DATA ADDRESS The data address is not allowed in the device

03 ILLEGAL DATA VALUE A value contained in the query field is wrong for the device

CLX Modbus (8/06)

Rev. 1.2

5.0 Warranty

HF scientific, inc., as vendor, warrants to the original purchaser of this instrument that it

will be free of defects in material and workmanship, in normal use and service, for a

period of one year from date of delivery to the original purchaser. HF scientific, inc.’s,

obligation under this warranty is limited to replacing, at its factory, the instrument or any

part thereof. Parts, which by their nature are normally required to be replaced

periodically, consistent with normal maintenance, specifically reagent, desiccant, sensors,

electrodes and fuses are excluded. Also excluded are accessories and supply type items.

Original purchaser is responsible for return of the instruments, or parts thereof, to HF

scientific, inc.’s factory. This includes all freight charges incurred in shipping to and from

HF scientific, inc.’s factory.

HF scientific, inc. is not responsible for damage to the instrument, or parts thereof,

resulting from misuse, environmental corrosion, negligence or accident, or defects

resulting from repairs, alterations or installation made by any person or company not

authorized by HF scientific, inc.

HF scientific, inc. assumes no liability for consequential damage of any kind, and the

original purchaser, by placement of any order for the instrument, or parts thereof, shall be

deemed liable for any and all damages incurred by the use or misuse of the instruments, or

parts thereof, by the purchaser, its employees, or others, following receipt thereof.

Carefully inspect this product for shipping damage, if damaged, immediately notify the

shipping company and arrange an on-site inspection. HF scientific, inc. cannot be

responsible for damage in shipment and cannot assist with claims without an on-site

inspection of the damage.

This warranty is given expressly and in lieu of all other warranties, expressed or implied.

Purchaser agrees that there is no warranty on merchantability and that there are no other

warranties, expressed or implied. No agent is authorized to assume for HF scientific, inc.

any liability except as set forth above.

HF scientific, inc.

3170 Metro Parkway

Fort Myers, Florida 33916-7597

Phone: (239) 337-2116

Fax: (239) 332-7643

CLX Modbus (8/06)

Rev. 1.2

Watts CLX - Modbus Owner's manual

Watts CLX - Modbus Owner's manual

Watts CLX - Modbus Owner's manual

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